University of Minnesota, Duluth. Department of Mathematical Sciences2022-07-132022-07-131982-04-08https://hdl.handle.net/11299/228345This issue is numbered Volume 6, Number 20, but should almost certainly be Volume 5, Number 21, as it is immediately preceded (April 1, 1982) by Volume 5, Number 20.enDepartment of Mathematics and StatisticsUniversity of Minnesota DuluthNewsletter